springboot第一步

package com.dark.horse.itim;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController//这个注解是表示注入SpringBoot IOC容器,以Json字符串的形式返回给客户端
public class HelloController {
    @RequestMapping("/hello")//定位到网址
    public String hello(){
        return "hello,springboot";
    }
}

配置文件：

优先级properties>yml>yaml

相同部分，读取的是优先级高的，不同部分照样读（

eg：properties：name=123

yml:name=456

age=5

结果为name=123，age=5）

yaml：简洁，数据为核心

people:
  name: lin  //people.name=lin,,,,,,
  age: 5   //peope.age=5

数据值后面记得加空格  eg：lin，霖，5....

缩进表层级关系

数组：

dog:
  - ko
  - jo

转义字符：

mag1: 'hello /n world'
#结果:hello /n world  单引号不识别转义字符
mag2: "hello /n world"
#结果:
#hello
#world  双引号识别转义字符

参数引用：

name: 张三
people:
  name: ${name}
  age: 5

@Value引入配置文件（适合导入少个）

package com.dark.horse.itim;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.env.Environment;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @Value("${people.name}")
    public String name;

    @Value("${people.age}")
    public String age;

    @Value("${age}")
    public String age1;

    @Value("${dog[0]}")
    public String dog1;

    @RequestMapping("/hello")
    public String hello(){
        System.out.println(name);//张三
        System.out.println(age);//5
        System.out.println(age1);//30
        System.out.println(dog1);//ko
        return dog1;
    }
}

@Autowired（更方便一点，只要注入一个对象）

package com.dark.horse.itim;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @Autowired
    private Environment env;

    @RequestMapping("/hello")
    public String hello(){

        System.out.println(env.getProperty("dog[1]"));
        return "age";
    }
}

别导错包了

@ConfigurationProperties

中间类

package com.dark.horse.itim;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;

import java.util.Arrays;

@Component
@ConfigurationProperties(prefix = "people")
public class person {
    private String name;
    private String age;
    private String[] cat;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String[] getCat() {
        return cat;
    }

    public void setCat(String[] cat) {
        this.cat = cat;
    }

    @Override
    public String toString() {
        return "person{" +
                "name='" + name + '\'' +
                ", age='" + age + '\'' +
//                ", cat=" + Arrays.toString(cat) +
                '}';
    }
}

 

package com.dark.horse.itim;
org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/hello1")
    public String hello1(){
        System.out.println(ps);
        String[] cat = ps.getCat();
        for(String s:cat){
            System.out.println(s);
        }
        return "ps";
    }
}

配置文件

people:
  name: ${name}
  age: 5
  cat:
    - lin
    - li